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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 2: 2+3+4+5+6+7+8+9+10+11+12= help mình

Toán Lớp 2: 2+3+4+5+6+7+8+9+10+11+12=
help mình

Comments ( 2 )

  1. 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12
    = ( 2 + 8) + ( 3 + 7) + ( 4 + 6) + 5 + 9 + 10 + 11 + 12
    = 10 + 10 + 10 + 5 + 9 + 10 + 11 + 12
    = ( 10 + 10 + 10 + 10) + 5 + 9 + 11 + 12
    = (40 + 5) + (11 + 12 + 9)
    = 45 + 32
    = 77
     

  2. 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 +11 + 12
    Có số số hạng là:
    (12 – 2) : 1 + 1 = 11
    Tổng trên là:
    (12 + 2) xx 11 : 2 = 77
     

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222-9+11+12:2*14+14 = ? ( )